Archiving question

Do you need an archiving license to enable archiving to a third party? I have enabled archiving to a test account on a local postfix mailserver, and have not seen a single e-mail send to it.

I'm using 5.0.15 NE, with plenty of user licenses to spare. I don't have any archive licenses, but was under the impression that you only need an archive license per archive mailbox. If I do the zmarchive command with -d (for soap messages) it looks like it takes the changes fine, and I can't find any error messages. Seems like it is just ignoring it.